But this just sounds like you're sticking to a viewpoint regardless of the facts presented. "Poor people are unhappy due to their lack of money, and rich people should be happy due to their money."

But the truth is everyone is less happy. Maybe there's something else going on.

Because money is a big issue.

There are plenty of real studies, not just this one, that people's happiness dramatically increases with money, up to a plateau, past that plateau happiness doesn't increase.

Last I checked, I think it was 70-80K Salary was a baseline. Below that, yes, happiness was really impacted by being without money.

And since this one was 'generic', across the population, and there are a lot of people <80K salaries, then yes, it is a big variable.